First slide

Chemical equations and calculations

Question

Which of the following statements is wrong about the reaction.
$4 {CrO}_{5} + 6 H_{2} {SO}_{4} \overset{}{\to} 2 {Cr}_{2} {({SO}_{4})}_{3} + 6 H_{2} O + 7 O_{2}$

Moderate

A

It is disproportionation reaction.
B

lt is a an intramolecular redox reaction.
C

Cr acts as an oxidant, whereas O acts as a reductant.
D

CrO₅ acts as oxidant and reductant both.

Solution

It changes to +3 in ${Cr}_{2} {({SO}_{4})}_{3}$
$3 e^{-} + {Cr}^{6 +} ⟶ {Cr}^{3 +}$ (reduction) (acts as oxidant)
Whereas O in CrO₅ changes to O₂
$2 O^{⊝} ⟶ O_{2} + 2 e^{-}$ (oxidation) (acts of reductant)
So, CrO₅ acts as oxidant and reductant both.
and also it is intramolecular redox reaction since in CrO₅, both Cr and O undergoes oxidation and reduction reaction.

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